To reheat plain, sauceless pasta, fill a large pot with water and add some salt, then place your pot on the stove and bring the water to a boil. Place your pre-cooked pasta into a heat-safe colander and submerge it into the boiling water for approximately 30 seconds to one minute.
According to The Manual, the tool that will deliver the best results is the oven. Place your pasta in a shallow, oven-proof dish, cover the dish with aluminum foil, and heat at 350 degrees for between 10-30 minutes.
If time is of the essence, reheating your pasta dish on the stove is another worthy alternative. Sautéing your pasta has the additional benefit of allowing you to add any additional spices, veggies, or cheese along the way.
You can replicate the creamy, evenly heated pasta dish from the night before using a microwave as well. Simply adding a little water to the dish and stirring often will keep your sauce thick and full of moisture and keep it from sticking together.